package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时的文件,需要转存到指定位置,否则本次请求完成后临时文件会被删除
        log.info(file.toString());

        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID重新生成文件名,防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定地址
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(fileName);
    }


    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流,通过文件输入流读取图片信息
            FileInputStream is = new FileInputStream(new File(basePath + name));

            //输出流，通过输出流将文件写回浏览器
            ServletOutputStream os = response.getOutputStream();

            //设置响应的内容以及编码方式为jpg
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[8192];
            while ((len = is.read(bytes)) != -1) {
                os.write(bytes, 0, len);
                os.flush();
            }
            //释放资源
            is.close();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}